メタデータ
| 項目 |
値 |
| Designation |
C/2007 K3 (Siding Spring) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-04-21T17:04:30.377280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:08Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
13.300 |
| K1 |
13.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-02-09.0000000 |
| e |
1.00124061 |
| q (au) |
2.050740 |
| a (au) |
-1653.004343 |
| i (deg) |
16.300560 |
| Ω (om, deg) |
263.252666 |
| ω (w, deg) |
23.593153 |
| M (ma, deg) |
-0.001066 |
等級
散乱 + 全体線形
$$
M_a = (15.559 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.559 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.529 |
| k |
0.800 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2007-04-18 |
2007-07-18 |
-5.6530 |
+2.025 |
| 2008-06-09 |
2008-09-30 |
+25.5862 |
-9.589 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
05:13:33.82 |
+24:01:57.3 |
HIP 24283 |
14.51 |
| 2026-06-01 12:00 |
05:13:37.34 |
+24:02:00.3 |
HIP 24283 |
15.20 |
| 2026-06-02 00:00 |
05:13:40.85 |
+24:02:03.3 |
HIP 24283 |
15.90 |
| 2026-06-02 12:00 |
05:13:44.37 |
+24:02:06.3 |
HIP 24283 |
16.62 |
| 2026-06-03 00:00 |
05:13:47.89 |
+24:02:09.4 |
HIP 24283 |
17.34 |
| 2026-06-03 12:00 |
05:13:51.42 |
+24:02:12.4 |
HIP 24283 |
18.07 |
| 2026-06-04 00:00 |
05:13:54.95 |
+24:02:15.4 |
HIP 24283 |
18.80 |
| 2026-06-04 12:00 |
05:13:58.48 |
+24:02:18.5 |
HIP 24283 |
19.54 |
| 2026-06-05 00:00 |
05:14:02.02 |
+24:02:21.5 |
HIP 24283 |
20.29 |
| 2026-06-05 12:00 |
05:14:05.55 |
+24:02:24.5 |
HIP 24487 |
20.26 |
| 2026-06-06 00:00 |
05:14:09.09 |
+24:02:27.6 |
HIP 24487 |
19.66 |
| 2026-06-06 12:00 |
05:14:12.63 |
+24:02:30.7 |
HIP 24487 |
19.08 |
| 2026-06-07 00:00 |
05:14:16.17 |
+24:02:33.7 |
HIP 24487 |
18.52 |
| 2026-06-07 12:00 |
05:14:19.72 |
+24:02:36.8 |
HIP 24487 |
17.98 |
| 2026-06-08 00:00 |
05:14:23.26 |
+24:02:39.8 |
HIP 24487 |
17.46 |
| 2026-06-08 12:00 |
05:14:26.81 |
+24:02:42.9 |
HIP 24487 |
16.96 |
| 2026-06-09 00:00 |
05:14:30.36 |
+24:02:46.0 |
HIP 24487 |
16.48 |
| 2026-06-09 12:00 |
05:14:33.90 |
+24:02:49.1 |
HIP 24487 |
16.03 |
| 2026-06-10 00:00 |
05:14:37.45 |
+24:02:52.1 |
HIP 24487 |
15.61 |
| 2026-06-10 12:00 |
05:14:41.00 |
+24:02:55.2 |
HIP 24487 |
15.23 |
| 2026-06-11 00:00 |
05:14:44.55 |
+24:02:58.3 |
HIP 24487 |
14.87 |
| 2026-06-11 12:00 |
05:14:48.10 |
+24:03:01.4 |
HIP 24487 |
14.56 |
| 2026-06-12 00:00 |
05:14:51.64 |
+24:03:04.5 |
HIP 24487 |
14.28 |
| 2026-06-12 12:00 |
05:14:55.19 |
+24:03:07.6 |
HIP 24487 |
14.05 |
| 2026-06-13 00:00 |
05:14:58.74 |
+24:03:10.6 |
HIP 24487 |
13.86 |
| 2026-06-13 12:00 |
05:15:02.28 |
+24:03:13.7 |
HIP 24487 |
13.71 |
| 2026-06-14 00:00 |
05:15:05.82 |
+24:03:16.8 |
HIP 24487 |
13.61 |
| 2026-06-14 12:00 |
05:15:09.37 |
+24:03:19.9 |
HIP 24487 |
13.56 |
| 2026-06-15 00:00 |
05:15:12.91 |
+24:03:23.0 |
HIP 24487 |
13.56 |
| 2026-06-15 12:00 |
05:15:16.44 |
+24:03:26.1 |
HIP 24487 |
13.61 |
| 2026-06-16 00:00 |
05:15:19.98 |
+24:03:29.2 |
HIP 24487 |
13.70 |
| 2026-06-16 12:00 |
05:15:23.51 |
+24:03:32.2 |
HIP 24487 |
13.84 |
| 2026-06-17 00:00 |
05:15:27.04 |
+24:03:35.3 |
HIP 24487 |
14.03 |
| 2026-06-17 12:00 |
05:15:30.57 |
+24:03:38.4 |
HIP 24487 |
14.26 |
| 2026-06-18 00:00 |
05:15:34.09 |
+24:03:41.5 |
HIP 24487 |
14.53 |
| 2026-06-18 12:00 |
05:15:37.61 |
+24:03:44.6 |
HIP 24487 |
14.84 |
| 2026-06-19 00:00 |
05:15:41.13 |
+24:03:47.6 |
HIP 24487 |
15.18 |
| 2026-06-19 12:00 |
05:15:44.64 |
+24:03:50.7 |
HIP 24487 |
15.56 |
| 2026-06-20 00:00 |
05:15:48.15 |
+24:03:53.8 |
HIP 24487 |
15.97 |
| 2026-06-20 12:00 |
05:15:51.65 |
+24:03:56.8 |
HIP 24487 |
16.41 |
| 2026-06-21 00:00 |
05:15:55.15 |
+24:03:59.9 |
HIP 24487 |
16.87 |
| 2026-06-21 12:00 |
05:15:58.64 |
+24:04:03.0 |
HIP 24487 |
17.36 |
| 2026-06-22 00:00 |
05:16:02.13 |
+24:04:06.0 |
HIP 24487 |
17.87 |